. it is a reminder that we've never seen governor romney in a one-on-one presidential debate and it's been four years since president obama had that experience against john mccain. so they're making sure everybody will be comfortable in the hall. the candidates do their own walk-throughs tomorrow to get comfortable with thatstage. but they're doing their final debate preps and the campaign staffs are conducting their pre-debate ritual, wolffe. >> and as they go through this, they actually do, you know, actual 90-minute or so q&a sessions, real debates, they got people pretending to be others, but they actually work through what's going on. >> reporter: they do. and both of the candidates have said that they're being grilled pretty hard in these debate sessions. senator john kerry, democrat of massachusetts, he's standing in for governor romney. senator rob portman, republican of ohio who's done this for years on the republican side, he's standing in for president obama. and both president obama and romney say they're getting roughed up. the president took a break, he had a campaign event out in nevad